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TMD26723 Datasheet(PDF) 3 Page - ams AG |
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TMD26723 Datasheet(HTML) 3 Page - ams AG |
3 / 29 page TMD2672 DIGITAL PROXIMITY DETECTOR TAOS149C − AUGUST 2012 2 r r Copyright E 2012, TAOS Inc. The LUMENOLOGY r Company www.taosinc.com Functional Block Diagram SDA INT SCL Wait Control Prox ADC Prox Control Prox Data IR LED Constant Current Sink Prox Integration Upper Limit Lower Limit Interrupt GND Channel 1 LEDA LEDK VDD LDR Channel 0 Detailed Description A fully integrated proximity detection solution is provided with an 850-nm IR LED, LED driver circuit, and proximity detection engine. An internal LED driver (LDR) pin, is externally connected to the LED cathode (LEDK) to provide a controlled LED sink current. This is accomplished with a proprietary current calibration technique that accounts for all variances in silicon, optics, package, and most important, IR LED output power. This eliminates or greatly reduces the need for factory calibration that is required for most discrete proximity sensor solutions. The device is factory calibrated to achieve a proximity count reading at a specified distance with a specific number of pulses. In use, the number of proximity LED pulses can be programmed from 1 to 255 pulses, which allows different proximity distances to be achieved. Each pulse has a 16- μs period, with a 7.2-μs on time. The device provides a separate pin for level-style interrupts. When interrupts are enabled and a pre-set value is exceeded, the interrupt pin is asserted and remains asserted until cleared by the controlling firmware. The interrupt feature simplifies and improves system efficiency by eliminating the need to poll a sensor for a proximity value. An interrupt is generated when the value of a proximity conversion exceeds either an upper or lower threshold. In addition, a programmable interrupt persistence feature allows the user to determine how many consecutive exceeded thresholds are necessary to trigger an interrupt. |
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